Ring vs Radial

[Silly Sausage]

Points 1 - 7 have their pros.
Point 9, irrelevant.

Point 8, see my 1 point. Out doos the rest.

 

[Guest55]

what the hell are you on about ?
read my challenge again , it was to come up with the longest list of pro's for each.
at least i took the trouble to put together a clear concise list.
you came up with 1 ?
well if you want to be unsporting about it and cop out , fair enough.
;-D

 

[Silly Sausage]

well so long as no-one takes my cheeky challenge too seriously , it may serve readers to think about all the design options in even simple domestic scenarios.

I'm not.

My 1 point still out weighs your 9 though

 

[Guest55]

of course it does , you win.

final score 1 - 9

 

[Silly Sausage]

Right, that's Ring v Radials sorted.......Next...

 

[Sparky Ninja]

Rings...

If you get a break in the cpc, the whole cct still has an earth; cpc break on a radial, no earth beyond that point.

also takes much less typing for a convincing argument

If your +1 for a ring final requires a fault to be in the radial then look at it this way.


Radial.

Break in cpc = socket outlet with no cpc = risk of electric shock = RCD* disconnect when imbalance occurs.

Ring final.

Break in ring final = no detection of fault as only one line conductor has slipped out = 2 x 2.5mm cables with a best case scenario current carrying capacity of 27A (surface clipped) protected by a 32A MCB = Overloaded cable = House Fire = Death




*assuming this argument refers to scenarios where 30mA RCD's are required for socket outlets <20A.


:30::30::30::30::30::30::30::30:

 

[Guest55]

i knew this as well widdler
one of the rings biggest advantages is also one of its biggest weaknesses - undetected breaks in the live.
but archy wasnt really up for reasoned debate lol.

 

[Sparky Ninja]

i knew this as well widdler
one of the rings biggest advantages is also one of its biggest weaknesses.
but archy wasnt really up for reasoned debate lol.

When the only argument for one type of a circuit is due to a fault in the other we've got to consider the alternative.

Personally I don't have a preference, I put selection down to functionality, demand and use.
But I do always inform people with the pro's and con's of both.

 

[Silly Sausage]

If your +1 for a ring final requires a fault to be in the radial then look at it this way.


Radial.

Break in cpc = socket outlet with no cpc = risk of electric shock = RCD* disconnect when imbalance occurs.

Ring final.

Break in ring final = no detection of fault as only one line conductor has slipped out = 2 x 2.5mm cables with a best case scenario current carrying capacity of 27A (surface clipped) protected by a 32A MCB = Overloaded cable = House Fire = Death




*assuming this argument refers to scenarios where 30mA RCD's are required for socket outlets <20A.


:30::30::30::30::30::30::30::30:

OK...failure of a cpc, then you're relying on the operation of the 'Additional' protection of an RCD, which quite a few people on this forum have stated that they are not to be 100% relied on.

A split ring, how often are you going to get >>20A down 1 leg for a significant length of time that it's going to fry a cable?


I'm sure this subject has been discussed by much higher beings than the likes of us and (to repeat myself) no definitive answer has been agreed on.




addition...

This argument is for domestic situation

 

[electric will]

I'm starting you use radials more and more, still ring normally in a kitchen though.
must say though bout a year ago wired some flats with rings came to testing and short between l and e found it between two sockets, all plastered up think chippy had put screw through cable fitting metal work for ceiling, running new cable at this stage not an option, it was about half way round the ring so made into two radials.
if it was radials in the first place this wouldn't have been an option

 

[Guest55]

A split ring, how often are you going to get >>20A down 1 leg for a significant length of time that it's going to fry a cable?

well if its a kitchen ring that has an undetected split , with the kettle , washing machine , dishwasher and tumble dryer and fan oven all fitted all close together on 1 wall of the kitchen , then its going to happen very frequently and for long periods.

 

[sedgy34]

I've got a house to do soon 4 levels going to wire each floor in radials and a kitchen ring

 

[Silly Sausage]

You've just picked up a few reels of 4mil cheap in Dudley then?

 

[cbw]

In fairness it will take a lot more than 27A to 'burn' a 2.5 cable

 

[Silly Sausage]

well if its a kitchen ring that has an undetected split , with the kettle , washing machine , dishwasher and tumble dryer and fan oven all fitted all close together on 1 wall of the kitchen , then its going to happen very frequently and for long periods.

Well that would be a badly designed cct then!
Unless you've got an obsessively caring lass, that's never going to happen anyway.